- About MogDB
- Quick Start
- Characteristic Description
- Overview
- High Performance
- CBO Optimizer
- LLVM
- Vectorized Engine
- Hybrid Row-Column Store
- Adaptive Compression
- Adaptive Two-phase Hash Aggregation
- SQL Bypass
- Kunpeng NUMA Architecture Optimization
- High Concurrency of Thread Pools
- SMP for Parallel Execution
- Xlog no Lock Flush
- Parallel Page-based Redo For Ustore
- Row-Store Execution to Vectorized Execution
- Astore Row Level Compression
- BTree Index Compression
- Tracing SQL Function
- Parallel Index Scan
- Parallel Query Optimization
- Enhancement of Tracing Backend Key Thread
- Ordering Operator Optimization
- OCK-accelerated Data Transmission
- OCK SCRLock Accelerate Distributed Lock
- Enhancement of WAL Redo Performance
- Enhancement of Dirty Pages Flushing Performance
- Sequential Scan Prefetch
- Ustore SMP Parallel Scanning
- Statement Level PLSQL Function Cache Support
- High Availability (HA)
- Primary/Standby
- Logical Replication
- Logical Backup
- Physical Backup
- Automatic Job Retry upon Failure
- Ultimate RTO
- High Availability Based on the Paxos Protocol
- Cascaded Standby Server
- Delayed Replay
- Adding or Deleting a Standby Server
- Delaying Entering the Maximum Availability Mode
- Parallel Logical Decoding
- DCF
- CM(Cluster Manager)
- Global SysCache
- Using a Standby Node to Build a Standby Node
- Two City and Three Center DR
- CM Cluster Management Component Supporting Two Node Deployment
- Query of the Original DDL Statement for a View
- MogDB/CM/PTK Dual Network Segment Support
- Enhanced Efficiency of Logical Backup and Restore
- Maintainability
- Workload Diagnosis Report (WDR)
- Slow SQL Diagnosis
- Session Performance Diagnosis
- System KPI-aided Diagnosis
- Fault Diagnosis
- Extension Splitting
- Built-in Stack Tool
- SQL PATCH
- Lightweight Lock Export and Analysis
- DCF Module Tracing
- Error When Writing Illegal Characters
- Support For Pageinspect & Pagehack
- Autonomous Transaction Management View and Termination
- Corrupt Files Handling
- Compatibility
- Add %rowtype Attribute To The View
- Aggregate Functions Distinct Performance Optimization
- Aggregate Functions Support Keep Clause
- Aggregate Functions Support Scenario Extensions
- Compatible With MySQL Alias Support For Single Quotes
- current_date/current_time Keywords As Field Name
- Custom Type Array
- For Update Support Outer Join
- MogDB Supports Insert All
- Oracle DBLink Syntax Compatibility
- Remove Type Conversion Hint When Creating PACKAGE/FUNCTION/PROCEDURE
- Support Bypass Method When Merge Into Hit Index
- Support For Adding Nocopy Attributes To Procedure And Function Parameters
- Support For Passing The Count Attribute Of An Array As A Parameter Of The Array Extend
- Support Q Quote Escape Character
- Support Subtracting Two Date Types To Return Numeric Type
- Support table()
- Support To Keep The Same Name After The End With Oracle
- Support Where Current Of
- Support For Constants In Package As Default Values
- Support PLPGSQL subtype
- Support Synonym Calls Without Parentheses For Function Without Parameters
- Support For dbms_utility.format_error_backtrace
- Support for PIVOT and UNPIVOT Syntax
- Mod Function Compatibility
- Support for Nesting of Aggregate Functions
- ORDER BY/GROUP BY Scenario Expansion
- Support for Modifying Table Log Properties After Table Creation
- Support for INSERT ON CONFLICT Clause
- Support for AUTHID CURRENT_USER
- Support for Stored Procedure OUT Parameters in PBE Mode
- Database Security
- Access Control Model
- Separation of Control and Access Permissions
- Database Encryption Authentication
- Data Encryption and Storage
- Database Audit
- Network Communication Security
- Resource Label
- Unified Audit
- Dynamic Data Anonymization
- Row-Level Access Control
- Password Strength Verification
- Equality Query in a Fully-encrypted Database
- Ledger Database Mechanism
- Transparent Data Encryption
- Enterprise-Level Features
- Support for Functions and Stored Procedures
- SQL Hints
- Full-Text Indexing
- Copy Interface for Error Tolerance
- Partitioning
- Support for Advanced Analysis Functions
- Materialized View
- HyperLogLog
- Creating an Index Online
- Autonomous Transaction
- Global Temporary Table
- Pseudocolumn ROWNUM
- Stored Procedure Debugging
- JDBC Client Load Balancing and Read/Write Isolation
- In-place Update Storage Engine
- Publication-Subscription
- Foreign Key Lock Enhancement
- Data Compression in OLTP Scenarios
- Transaction Async Submit
- Index Creation Parallel Control
- Dynamic Partition Pruning
- COPY Import Optimization
- SQL Running Status Observation
- BRIN Index
- BLOOM Index
- Event Trigger
- Scrollable Cursor Support for Reverse Retrieval
- Support for Pruning Subquery Projection Columns
- Pruning ORDER BY in Subqueries
- Automatic Creation of Indexes Supporting Fuzzy Matching
- Support for Importing and Exporting Specific Objects
- Application Development Interfaces
- AI Capabilities
- Middleware
- Workload Management
- Installation Guide
- Upgrade Guide
- Administrator Guide
- Localization
- Routine Maintenance
- Starting and Stopping MogDB
- Using the gsql Client for Connection
- Routine Maintenance
- Checking OS Parameters
- Checking MogDB Health Status
- Checking Database Performance
- Checking and Deleting Logs
- Checking Time Consistency
- Checking The Number of Application Connections
- Routinely Maintaining Tables
- Routinely Recreating an Index
- Exporting and Viewing the WDR
- Data Security Maintenance Suggestions
- Slow SQL Diagnosis
- Log Reference
- Primary and Standby Management
- Column-store Tables Management
- Backup and Restoration
- Database Deployment Solutions
- Importing and Exporting Data
- High Available Guide
- AI Features Guide
- AI4DB: Autonomous Database O&M
- DBMind Mode
- Components that Support DBMind
- AI Sub-functions of the DBMind
- ABO Optimizer
- DB4AI: Database-driven AI
- AI4DB: Autonomous Database O&M
- Security Guide
- Developer Guide
- Application Development Guide
- Development Specifications
- Development Based on JDBC
- JDBC Package, Driver Class, and Environment Class
- Development Process
- Loading the Driver
- Connecting to a Database
- Connecting to the Database (Using SSL)
- Connecting to the Database (Using UDS)
- Running SQL Statements
- Processing Data in a Result Set
- Closing a Connection
- Managing Logs
- Example: Common Operations
- Example: Retrying SQL Queries for Applications
- Example: Importing and Exporting Data Through Local Files
- Example 2: Migrating Data from a MY Database to MogDB
- Example: Logic Replication Code
- Example: Parameters for Connecting to the Database in Different Scenarios
- Example: JDBC Primary/Standby Cluster Load Balancing
- JDBC API Reference
- java.sql.Connection
- java.sql.CallableStatement
- java.sql.DatabaseMetaData
- java.sql.Driver
- java.sql.PreparedStatement
- java.sql.ResultSet
- java.sql.ResultSetMetaData
- java.sql.Statement
- javax.sql.ConnectionPoolDataSource
- javax.sql.DataSource
- javax.sql.PooledConnection
- javax.naming.Context
- javax.naming.spi.InitialContextFactory
- CopyManager
- JDBC-based Common Parameter Reference
- JDBC Release Notes
- Development Based on ODBC
- Development Based on libpq
- Psycopg2-Based Development
- Commissioning
- Stored Procedure
- User Defined Functions
- PL/pgSQL-SQL Procedural Language
- Scheduled Jobs
- Autonomous Transaction
- Logical Replication
- Extension
- MySQL Compatibility Description
- Dolphin Extension
- Dolphin Overview
- Dolphin Installation
- Dolphin Restrictions
- Dolphin Syntax
- SQL Reference
- Keywords
- Data Types
- Functions and Operators
- Assignment Operators
- Character Processing Functions and Operators
- Arithmetic Functions and Operators
- Dolphin Lock
- Date and Time Processing Functions and Operators
- Advisory Lock Functions
- Network Address Functions and Operators
- Conditional Expression Functions
- Aggregate Functions
- System Information Functions
- Logical Operators
- Bit String Functions and Operators
- JSON-JSONB Functions and Operators
- Type Conversion Functions
- Compatible Operators and Operations
- Comment Operators
- Expressions
- DDL Syntax
- DML Syntax
- DCL Syntax
- SQL Syntax
- ALTER DATABASE
- ALTER FUNCTION
- ALTER PROCEDURE
- ALTER SERVER
- ALTER TABLE
- ALTER TABLE PARTITION
- ALTER TABLESPACE
- ALTER VIEW
- ANALYZE | ANALYSE
- AST
- CHECKSUM TABLE
- CREATE DATABASE
- CREATE FUNCTION
- CREATE INDEX
- CREATE PROCEDURE
- CREATE SERVER
- CREATE TABLE
- CREATE TABLE AS
- CREATE TABLE PARTITION
- CREATE TABLESPACE
- CREATE TRIGGER
- CREATE VIEW
- DESCRIBE TABLE
- DO
- DROP DATABASE
- DROP INDEX
- DROP TABLESPACE
- EXECUTE
- EXPLAIN
- FLUSH BINARY LOGS
- GRANT
- GRANT/REVOKE PROXY
- INSERT
- KILL
- LOAD DATA
- OPTIMIZE TABLE
- PREPARE
- RENAME TABLE
- RENAME USER
- REVOKE
- SELECT
- SELECT HINT
- SET CHARSET
- SET PASSWORD
- SHOW CHARACTER SET
- SHOW COLLATION
- SHOW COLUMNS
- SHOW CREATE DATABASE
- SHOW CREATE FUNCTION
- SHOW CREATE PROCEDURE
- SHOW CREATE TABLE
- SHOW CREATE TRIGGER
- SHOW CREATE VIEW
- SHOW DATABASES
- SHOW FUNCTION STATUS
- SHOW GRANTS
- SHOW INDEX
- SHOW MASTER STATUS
- SHOW PLUGINS
- SHOW PRIVILEGES
- SHOW PROCEDURE STATUS
- SHOW PROCESSLIST
- SHOW SLAVE HOSTS
- SHOW STATUS
- SHOW TABLES
- SHOW TABLE STATUS
- SHOW TRIGGERS
- SHOW VARIABLES
- SHOW WARNINGS/ERRORS
- UPDATE
- USE db_name
- System Views
- GUC Parameters
- Resetting Parameters
- Stored Procedures
- Identifiers
- SQL Reference
- MySQL Syntax Compatibility Assessment Tool
- Dolphin Extension
- Materialized View
- Partition Management
- Application Development Guide
- Performance Tuning Guide
- Reference Guide
- System Catalogs and System Views
- Overview
- Querying a System Catalog
- System Catalogs
- GS_ASP
- GS_AUDITING_POLICY
- GS_AUDITING_POLICY_ACCESS
- GS_AUDITING_POLICY_FILTERS
- GS_AUDITING_POLICY_PRIVILEGES
- GS_CLIENT_GLOBAL_KEYS
- GS_CLIENT_GLOBAL_KEYS_ARGS
- GS_COLUMN_KEYS
- GS_COLUMN_KEYS_ARGS
- GS_DB_PRIVILEGE
- GS_ENCRYPTED_COLUMNS
- GS_ENCRYPTED_PROC
- GS_GLOBAL_CHAIN
- GS_GLOBAL_CONFIG
- GS_MASKING_POLICY
- GS_MASKING_POLICY_ACTIONS
- GS_MASKING_POLICY_FILTERS
- GS_MATVIEW
- GS_MATVIEW_DEPENDENCY
- GS_MODEL_WAREHOUSE
- GS_OPT_MODEL
- GS_PACKAGE
- GS_POLICY_LABEL
- GS_RECYCLEBIN
- GS_TXN_SNAPSHOT
- GS_UID
- GS_WLM_EC_OPERATOR_INFO
- GS_WLM_INSTANCE_HISTORY
- GS_WLM_OPERATOR_INFO
- GS_WLM_PLAN_ENCODING_TABLE
- GS_WLM_PLAN_OPERATOR_INFO
- GS_WLM_SESSION_QUERY_INFO_ALL
- GS_WLM_USER_RESOURCE_HISTORY
- PG_AGGREGATE
- PG_AM
- PG_AMOP
- PG_AMPROC
- PG_APP_WORKLOADGROUP_MAPPING
- PG_ATTRDEF
- PG_ATTRIBUTE
- PG_AUTH_HISTORY
- PG_AUTH_MEMBERS
- PG_AUTHID
- PG_CAST
- PG_CLASS
- PG_COLLATION
- PG_CONSTRAINT
- PG_CONVERSION
- PG_DATABASE
- PG_DB_ROLE_SETTING
- PG_DEFAULT_ACL
- PG_DEPEND
- PG_DESCRIPTION
- PG_DIRECTORY
- PG_ENUM
- PG_EVENT_TRIGGER
- PG_EXTENSION
- PG_EXTENSION_DATA_SOURCE
- PG_FOREIGN_DATA_WRAPPER
- PG_FOREIGN_SERVER
- PG_FOREIGN_TABLE
- PG_HASHBUCKET
- PG_INDEX
- PG_INHERITS
- PG_JOB
- PG_JOB_PROC
- PG_LANGUAGE
- PG_LARGEOBJECT
- PG_LARGEOBJECT_METADATA
- PG_NAMESPACE
- PG_OBJECT
- PG_OPCLASS
- PG_OPERATOR
- PG_OPFAMILY
- PG_PARTITION
- PG_PLTEMPLATE
- PG_PROC
- PG_PUBLICATION
- PG_PUBLICATION_REL
- PG_RANGE
- PG_REPLICATION_ORIGIN
- PG_RESOURCE_POOL
- PG_REWRITE
- PG_RLSPOLICY
- PG_SECLABEL
- PG_SET
- PG_SHDEPEND
- PG_SHDESCRIPTION
- PG_SHSECLABEL
- PG_STATISTIC
- PG_STATISTIC_EXT
- PG_SUBSCRIPTION
- PG_SUBSCRIPTION_REL
- PG_SYNONYM
- PG_TABLESPACE
- PG_TRIGGER
- PG_TS_CONFIG
- PG_TS_CONFIG_MAP
- PG_TS_DICT
- PG_TS_PARSER
- PG_TS_TEMPLATE
- PG_TYPE
- PG_USER_MAPPING
- PG_USER_STATUS
- PG_WORKLOAD_GROUP
- PGXC_CLASS
- PGXC_GROUP
- PGXC_NODE
- PGXC_SLICE
- PLAN_TABLE_DATA
- STATEMENT_HISTORY
- System Views
- GET_GLOBAL_PREPARED_XACTS(Discarded)
- GS_ASYNC_SUBMIT_SESSIONS_STATUS
- GS_AUDITING
- GS_AUDITING_ACCESS
- GS_AUDITING_PRIVILEGE
- GS_CLUSTER_RESOURCE_INFO
- GS_COMPRESSION
- GS_DB_PRIVILEGES
- GS_FILE_STAT
- GS_GSC_MEMORY_DETAIL
- GS_INSTANCE_TIME
- GS_LABELS
- GS_LSC_MEMORY_DETAIL
- GS_MASKING
- GS_MATVIEWS
- GS_OS_RUN_INFO
- GS_REDO_STAT
- GS_SESSION_CPU_STATISTICS
- GS_SESSION_MEMORY
- GS_SESSION_MEMORY_CONTEXT
- GS_SESSION_MEMORY_DETAIL
- GS_SESSION_MEMORY_STATISTICS
- GS_SESSION_STAT
- GS_SESSION_TIME
- GS_SHARED_MEMORY_DETAIL
- GS_SQL_COUNT
- GS_STAT_SESSION_CU
- GS_THREAD_MEMORY_CONTEXT
- GS_TOTAL_MEMORY_DETAIL
- GS_WLM_CGROUP_INFO
- GS_WLM_EC_OPERATOR_STATISTICS
- GS_WLM_OPERATOR_HISTORY
- GS_WLM_OPERATOR_STATISTICS
- GS_WLM_PLAN_OPERATOR_HISTORY
- GS_WLM_REBUILD_USER_RESOURCE_POOL
- GS_WLM_RESOURCE_POOL
- GS_WLM_SESSION_HISTORY
- GS_WLM_SESSION_INFO
- GS_WLM_SESSION_INFO_ALL
- GS_WLM_SESSION_STATISTICS
- GS_WLM_USER_INFO
- IOS_STATUS
- MPP_TABLES
- PG_AVAILABLE_EXTENSION_VERSIONS
- PG_AVAILABLE_EXTENSIONS
- PG_COMM_DELAY
- PG_COMM_RECV_STREAM
- PG_COMM_SEND_STREAM
- PG_COMM_STATUS
- PG_CONTROL_GROUP_CONFIG
- PG_CURSORS
- PG_EXT_STATS
- PG_GET_INVALID_BACKENDS
- PG_GET_SENDERS_CATCHUP_TIME
- PG_GROUP
- PG_GTT_ATTACHED_PIDS
- PG_GTT_RELSTATS
- PG_GTT_STATS
- PG_INDEXES
- PG_LOCKS
- PG_NODE_ENV
- PG_OS_THREADS
- PG_PREPARED_STATEMENTS
- PG_PREPARED_XACTS
- PG_PUBLICATION_TABLES
- PG_REPLICATION_ORIGIN_STATUS
- PG_REPLICATION_SLOTS
- PG_RLSPOLICIES
- PG_ROLES
- PG_RULES
- PG_RUNNING_XACTS
- PG_SECLABELS
- PG_SESSION_IOSTAT
- PG_SESSION_WLMSTAT
- PG_SETTINGS
- PG_SHADOW
- PG_STAT_ACTIVITY
- PG_STAT_ACTIVITY_NG
- PG_STAT_ALL_INDEXES
- PG_STAT_ALL_TABLES
- PG_STAT_BAD_BLOCK
- PG_STAT_BGWRITER
- PG_STAT_DATABASE
- PG_STAT_DATABASE_CONFLICTS
- PG_STAT_REPLICATION
- PG_STAT_SUBSCRIPTION
- PG_STAT_SYS_INDEXES
- PG_STAT_SYS_TABLES
- PG_STAT_USER_FUNCTIONS
- PG_STAT_USER_INDEXES
- PG_STAT_USER_TABLES
- PG_STAT_XACT_ALL_TABLES
- PG_STAT_XACT_SYS_TABLES
- PG_STAT_XACT_USER_FUNCTIONS
- PG_STAT_XACT_USER_TABLES
- PG_STATIO_ALL_INDEXES
- PG_STATIO_ALL_SEQUENCES
- PG_STATIO_ALL_TABLES
- PG_STATIO_SYS_INDEXES
- PG_STATIO_SYS_SEQUENCES
- PG_STATIO_SYS_TABLES
- PG_STATIO_USER_INDEXES
- PG_STATIO_USER_SEQUENCES
- PG_STATIO_USER_TABLES
- PG_STATS
- PG_TABLES
- PG_TDE_INFO
- PG_THREAD_WAIT_STATUS
- PG_TIMEZONE_ABBREVS
- PG_TIMEZONE_NAMES
- PG_TOTAL_MEMORY_DETAIL
- PG_TOTAL_USER_RESOURCE_INFO
- PG_TOTAL_USER_RESOURCE_INFO_OID
- PG_USER
- PG_USER_MAPPINGS
- PG_VARIABLE_INFO
- PG_VIEWS
- PG_WLM_STATISTICS
- PGXC_PREPARED_XACTS
- PLAN_TABLE
- PATCH_INFORMATION_TABLE
- Functions and Operators
- Logical Operators
- Comparison Operators
- Character Processing Functions and Operators
- Binary String Functions and Operators
- Bit String Functions and Operators
- Mode Matching Operators
- Mathematical Functions and Operators
- Date and Time Processing Functions and Operators
- Type Conversion Functions
- Geometric Functions and Operators
- Network Address Functions and Operators
- Text Search Functions and Operators
- JSON/JSONB Functions and Operators
- HLL Functions and Operators
- SEQUENCE Functions
- Array Functions and Operators
- Range Functions and Operators
- Aggregate Functions
- Window Functions(Analysis Functions)
- Security Functions
- Ledger Database Functions
- Encrypted Equality Functions
- Set Returning Functions
- Conditional Expression Functions
- System Information Functions
- System Administration Functions
- Configuration Settings Functions
- Universal File Access Functions
- Server Signal Functions
- Backup and Restoration Control Functions
- Snapshot Synchronization Functions
- Database Object Functions
- Advisory Lock Functions
- Logical Replication Functions
- Segment-Page Storage Functions
- Other Functions
- Undo System Functions
- Row-store Compression System Functions
- Statistics Information Functions
- Trigger Functions
- Event Trigger Functions
- Hash Function
- Prompt Message Function
- Global Temporary Table Functions
- Fault Injection System Function
- AI Feature Functions
- Dynamic Data Masking Functions
- Other System Functions
- Internal Functions
- Global SysCache Feature Functions
- Data Damage Detection and Repair Functions
- XML Functions
- Obsolete Functions
- Supported Data Types
- SQL Syntax
- ABORT
- ALTER AGGREGATE
- ALTER AUDIT POLICY
- ALTER DATABASE
- ALTER DATA SOURCE
- ALTER DEFAULT PRIVILEGES
- ALTER DIRECTORY
- ALTER EVENT
- ALTER EVENT TRIGGER
- ALTER EXTENSION
- ALTER FOREIGN DATA WRAPPER
- ALTER FOREIGN TABLE
- ALTER FUNCTION
- ALTER GLOBAL CONFIGURATION
- ALTER GROUP
- ALTER INDEX
- ALTER LANGUAGE
- ALTER LARGE OBJECT
- ALTER MASKING POLICY
- ALTER MATERIALIZED VIEW
- ALTER OPERATOR
- ALTER PACKAGE
- ALTER PROCEDURE
- ALTER PUBLICATION
- ALTER RESOURCE LABEL
- ALTER RESOURCE POOL
- ALTER ROLE
- ALTER ROW LEVEL SECURITY POLICY
- ALTER RULE
- ALTER SCHEMA
- ALTER SEQUENCE
- ALTER SERVER
- ALTER SESSION
- ALTER SUBSCRIPTION
- ALTER SYNONYM
- ALTER SYSTEM KILL SESSION
- ALTER SYSTEM SET
- ALTER TABLE
- ALTER TABLE PARTITION
- ALTER TABLE SUBPARTITION
- ALTER TABLESPACE
- ALTER TEXT SEARCH CONFIGURATION
- ALTER TEXT SEARCH DICTIONARY
- ALTER TRIGGER
- ALTER TYPE
- ALTER USER
- ALTER USER MAPPING
- ALTER VIEW
- ANALYZE | ANALYSE
- BEGIN
- CALL
- CHECKPOINT
- CLEAN CONNECTION
- CLOSE
- CLUSTER
- COMMENT
- COMMIT | END
- COMMIT PREPARED
- CONNECT BY
- COPY
- CREATE AGGREGATE
- CREATE AUDIT POLICY
- CREATE CAST
- CREATE CLIENT MASTER KEY
- CREATE COLUMN ENCRYPTION KEY
- CREATE DATABASE
- CREATE DATA SOURCE
- CREATE DIRECTORY
- CREATE EVENT
- CREATE EVENT TRIGGER
- CREATE EXTENSION
- CREATE FOREIGN DATA WRAPPER
- CREATE FOREIGN TABLE
- CREATE FUNCTION
- CREATE GROUP
- CREATE INCREMENTAL MATERIALIZED VIEW
- CREATE INDEX
- CREATE LANGUAGE
- CREATE MASKING POLICY
- CREATE MATERIALIZED VIEW
- CREATE MODEL
- CREATE OPERATOR
- CREATE PACKAGE
- CREATE PROCEDURE
- CREATE PUBLICATION
- CREATE RESOURCE LABEL
- CREATE RESOURCE POOL
- CREATE ROLE
- CREATE ROW LEVEL SECURITY POLICY
- CREATE RULE
- CREATE SCHEMA
- CREATE SEQUENCE
- CREATE SERVER
- CREATE SUBSCRIPTION
- CREATE SYNONYM
- CREATE TABLE
- CREATE TABLE AS
- CREATE TABLE PARTITION
- CREATE TABLESPACE
- CREATE TABLE SUBPARTITION
- CREATE TEXT SEARCH CONFIGURATION
- CREATE TEXT SEARCH DICTIONARY
- CREATE TRIGGER
- CREATE TYPE
- CREATE USER
- CREATE USER MAPPING
- CREATE VIEW
- CREATE WEAK PASSWORD DICTIONARY
- CURSOR
- DEALLOCATE
- DECLARE
- DELETE
- DELIMITER
- DO
- DROP AGGREGATE
- DROP AUDIT POLICY
- DROP CAST
- DROP CLIENT MASTER KEY
- DROP COLUMN ENCRYPTION KEY
- DROP DATABASE
- DROP DATA SOURCE
- DROP DIRECTORY
- DROP EVENT
- DROP EVENT TRIGGER
- DROP EXTENSION
- DROP FOREIGN DATA WRAPPER
- DROP FOREIGN TABLE
- DROP FUNCTION
- DROP GLOBAL CONFIGURATION
- DROP GROUP
- DROP INDEX
- DROP LANGUAGE
- DROP MASKING POLICY
- DROP MATERIALIZED VIEW
- DROP MODEL
- DROP OPERATOR
- DROP OWNED
- DROP PACKAGE
- DROP PROCEDURE
- DROP PUBLICATION
- DROP RESOURCE LABEL
- DROP RESOURCE POOL
- DROP ROLE
- DROP ROW LEVEL SECURITY POLICY
- DROP RULE
- DROP SCHEMA
- DROP SEQUENCE
- DROP SERVER
- DROP SUBSCRIPTION
- DROP SYNONYM
- DROP TABLE
- DROP TABLESPACE
- DROP TEXT SEARCH CONFIGURATION
- DROP TEXT SEARCH DICTIONARY
- DROP TRIGGER
- DROP TYPE
- DROP USER
- DROP USER MAPPING
- DROP VIEW
- DROP WEAK PASSWORD DICTIONARY
- EXECUTE
- EXECUTE DIRECT
- EXPLAIN
- EXPLAIN PLAN
- FETCH
- GRANT
- INSERT
- LOCK
- MERGE INTO
- MOVE
- PREDICT BY
- PREPARE
- PREPARE TRANSACTION
- PURGE
- REASSIGN OWNED
- REFRESH INCREMENTAL MATERIALIZED VIEW
- REFRESH MATERIALIZED VIEW
- REINDEX
- RELEASE SAVEPOINT
- RESET
- REVOKE
- ROLLBACK
- ROLLBACK PREPARED
- ROLLBACK TO SAVEPOINT
- SAVEPOINT
- SELECT
- SELECT INTO
- SET
- SET CONSTRAINTS
- SET ROLE
- SET SESSION AUTHORIZATION
- SET TRANSACTION
- SHOW
- SHOW EVENTS
- SHRINK
- SHUTDOWN
- SNAPSHOT
- START TRANSACTION
- TIMECAPSULE TABLE
- TRUNCATE
- UPDATE
- VACUUM
- VALUES
- SQL Reference
- MogDB SQL
- Keywords
- Constant and Macro
- Expressions
- Type Conversion
- Full Text Search
- System Operation
- DDL Syntax Overview
- DML Syntax Overview
- DCL Syntax Overview
- Subquery
- LLVM
- Alias
- Lock
- Transaction
- Ordinary Table
- Partitioned Table
- Index
- Constraints
- Cursors
- Anonymous Block
- Trigger
- INSERT_RIGHT_REF_DEFAULT_VALUE
- Appendix
- GUC Parameters
- GUC Parameter Usage
- GUC Parameter List
- File Location
- Connection and Authentication
- Resource Consumption
- Write Ahead Log
- HA Replication
- Query Planning
- Error Reporting and Logging
- Alarm Detection
- Statistics During the Database Running
- Load Management
- Automatic Vacuuming
- Default Settings of Client Connection
- Lock Management
- Version and Platform Compatibility
- Faut Tolerance
- Connection Pool Parameters
- MogDB Transaction
- Replication Parameters of Two Database Instances
- Developer Options
- Auditing
- CM Parameters
- Backend Compression
- Upgrade Parameters
- Miscellaneous Parameters
- Wait Events
- Query
- System Performance Snapshot
- Security Configuration
- Global Temporary Table
- HyperLogLog
- Scheduled Task
- Thread Pool
- User-defined Functions
- Backup and Restoration
- DCF Parameters Settings
- Flashback
- Rollback Parameters
- Reserved Parameters
- AI Features
- Global SysCache Parameters
- Multi-Level Cache Management Parameters
- Resource Pooling Parameters
- Parameters Related to Efficient Data Compression Algorithms
- Writer Statement Parameters Supported by Standby Servers
- Data Import and Export
- Delimiter
- Appendix
- Schema
- Information Schema
- DBE_PERF
- OS
- Instance
- Memory
- File
- Object
- STAT_USER_TABLES
- SUMMARY_STAT_USER_TABLES
- GLOBAL_STAT_USER_TABLES
- STAT_USER_INDEXES
- SUMMARY_STAT_USER_INDEXES
- GLOBAL_STAT_USER_INDEXES
- STAT_SYS_TABLES
- SUMMARY_STAT_SYS_TABLES
- GLOBAL_STAT_SYS_TABLES
- STAT_SYS_INDEXES
- SUMMARY_STAT_SYS_INDEXES
- GLOBAL_STAT_SYS_INDEXES
- STAT_ALL_TABLES
- SUMMARY_STAT_ALL_TABLES
- GLOBAL_STAT_ALL_TABLES
- STAT_ALL_INDEXES
- SUMMARY_STAT_ALL_INDEXES
- GLOBAL_STAT_ALL_INDEXES
- STAT_DATABASE
- SUMMARY_STAT_DATABASE
- GLOBAL_STAT_DATABASE
- STAT_DATABASE_CONFLICTS
- SUMMARY_STAT_DATABASE_CONFLICTS
- GLOBAL_STAT_DATABASE_CONFLICTS
- STAT_XACT_ALL_TABLES
- SUMMARY_STAT_XACT_ALL_TABLES
- GLOBAL_STAT_XACT_ALL_TABLES
- STAT_XACT_SYS_TABLES
- SUMMARY_STAT_XACT_SYS_TABLES
- GLOBAL_STAT_XACT_SYS_TABLES
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- SUMMARY_STAT_XACT_USER_TABLES
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- STAT_XACT_USER_FUNCTIONS
- SUMMARY_STAT_XACT_USER_FUNCTIONS
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- STAT_BAD_BLOCK
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- SUMMARY_STATEMENT
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- GLOBAL_STATEMENT_COMPLEX_HISTORY
- GLOBAL_STATEMENT_COMPLEX_HISTORY_TABLE
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- STATEMENT_RESPONSETIME_PERCENTILE
- STATEMENT_COMPLEX_RUNTIME
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- STATEMENT_HISTORY
- Cache/IO
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- Utility
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- Error Code Reference
- Description of SQL Error Codes
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- GAUSS-00001 - GAUSS-00100
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- GAUSS 03901 - GAUSS 04000
- GAUSS 04001 - GAUSS 04100
- GAUSS 04101 - GAUSS 04200
- GAUSS 04201 - GAUSS 04300
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- GAUSS 04901 - GAUSS 05000
- GAUSS 05001 - GAUSS 05100
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- GAUSS 05901 - GAUSS 06000
- GAUSS 06001 - GAUSS 06100
- GAUSS 06101 - GAUSS 06200
- GAUSS 06201 - GAUSS 06300
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- GAUSS 06601 - GAUSS 06700
- GAUSS 06701 - GAUSS 06800
- GAUSS 06801 - GAUSS 06900
- GAUSS 06901 - GAUSS 07000
- GAUSS 07001 - GAUSS 07100
- GAUSS 07101 - GAUSS 07200
- GAUSS 07201 - GAUSS 07300
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- GAUSS 07401 - GAUSS 07500
- GAUSS 50000 - GAUSS 50999
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- Error Log Reference
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- A Query Error Is Reported Due to Predicate Pushdown
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Viewing WDRs
Database Stat
The following table describes columns in the Database Stat report.
Table 1 Columns in the Database Stat report
Column | Description |
---|---|
DB Name | Database name. |
Backends | Number of backends connected to this database. |
Xact Commit | Number of transactions in this database that have been committed. |
Xact Rollback | Number of transactions in this database that have been rolled back. |
Blks Read | Number of disk blocks read in this database. |
Blks Hit | Number of times that disk blocks have been found in the cache. |
Tuple Returned | Number of rows sequentially scanned. |
Tuple Fetched | Number of rows randomly scanned. |
Tuple Inserted | Number of rows inserted by queries in this database. |
Tuple Updated | Number of rows updated by queries in this database. |
Tup Deleted | Number of rows deleted by queries in this database. |
Conflicts | Number of queries canceled due to conflicts. |
Temp Files | Number of temporary files created by queries in this database. |
Temp Bytes | Total amount of data written to temporary files by queries in this database. |
Deadlocks | Number of deadlocks detected in this database. |
Blk Read Time | Time spent reading data file blocks by backends in this database (unit: ms). |
Blk Write Time | Time spent writing into data file blocks by backends in this database (unit: ms). |
Stats Reset | Time at which the current statistics were reset. |
Load Profile
The following table lists metrics in the Load Profile report.
Table 2 Metrics in the Load Profile report
Metric | Description |
---|---|
DB Time(us) | Total elapsed time of a job. |
CPU Time(us) | Total CPU time used for job running. |
Redo size(blocks) | Size of the generated WAL (blocks). |
Logical read (blocks) | Number of logical reads (blocks) on a table or an index. |
Physical read (blocks) | Number of physical reads (blocks) on a table or an index. |
Physical write (blocks) | Number of physical writes (blocks) on a table or an index. |
Read IO requests | Number of times that a table or an index is read. |
Write IO requests | Number of times that a table or an index is written. |
Read IO (MB) | Table or index read size (MB). |
Write IO (MB) | Table or index write size (MB). |
Logons | Number of logins. |
Executes (SQL) | Number of times the SQL statement is executed. |
Rollbacks | Number of rolled-back transactions. |
Transactions | Number of transactions. |
SQL response time P95(us) | Response time of 95% SQL statements. |
SQL response time P80(us) | Response time of 80% SQL statements. |
Instance Efficiency Percentages
The following table lists metrics in the Instance Efficiency Percentages report.
Table 3 Metrics in the Instance Efficiency Percentages report
Metric | Description |
---|---|
Buffer Hit % | Hit ratio of the buffer pool. |
Effective CPU % | Ratio of the CPU time to the DB time. |
WalWrite NoWait % | Ratio of the number of events that access the WAL buffer to the total number of wait events. |
Soft Parse % | Ratio of the number of soft parsing times to the total number of parsing times. |
Non-Parse CPU % | Ratio of the non-parse time to the total execution time. |
Top 10 Events by Total Wait Time
The following table lists columns in the Top 10 Events by Total Wait Time report.
Table 4 Columns in the Top 10 Events by Total Wait Time report
Column | Description |
---|---|
Event | Name of a wait event. |
Waits | Number of wait times. |
Total Wait Time(us) | Total wait time, in microseconds. |
Avg Wait Time(us) | Average wait time, in microseconds. |
Type | Wait event type. |
Wait Classes by Total Wait Time
The following table lists columns in the Wait Classes by Total Wait Time report.
Table 5 Columns in the Wait Classes by Total Wait Time report
Column | Description |
---|---|
Type | Wait events are classified as follows: - STATUS。 - LWLOCK_EVENT。 - LOCK_EVENT。 - IO_EVENT。 |
Waits | Number of wait times. |
Total Wait Time(us) | Total wait time, in microseconds. |
Avg Wait Time(us) | Average wait time, in microseconds. |
Host CPU
The following table describes columns in the Host CPU report.
Table 6 Columns in the Host CPU report
Column | Description |
---|---|
Cpus | Number of processors. |
Cores | Number of CPU cores. |
Sockets | Number of CPU sockets. |
Load Average Begin | Load average value of the start snapshot. |
Load Average End | Load average value of the end snapshot. |
%User | Percentage of CPU time spent in the user mode. |
%System | Percentage of CPU time spent in the kernel mode. |
%WIO | Percentage of CPU time spent in wait I/O. |
%Idle | Percentage of CPU idle time. |
IO Profile
The following table lists metrics in the IO Profile report.
Table 7 Metrics in the IO Profile report
Metric | Description |
---|---|
Database requests | Number of database I/O times. |
Database (MB) | Database I/O data volume. |
Database (blocks) | Number of database I/O data blocks. |
Redo requests | Number of redo I/O times. |
Redo (MB) | Redo I/O data volume. |
Memory Statistics
The following table lists metrics in the Memory Statistics report.
Table 8 Columns in the Memory Statistics report
Metric | Description |
---|---|
shared_used_memory | Size of used shared memory (MB). |
max_shared_memory | Maximum shared memory (MB). |
process_used_memory | Memory used by processes (MB). |
max_process_memory | Maximum memory that can be allocated to a process (MB). |
Time Model
The following table describes metrics in the Time Model report.
Table 9 Metrics in the Time Model report
Metric | Description |
---|---|
DB_TIME | Total end-to-end wall time consumed by all threads (unit: μs). |
EXECUTION_TIME | Total time consumed on the executor (unit: μs). |
PL_EXECUTION_TIME | Total time consumed for executing PL/SQL statements (unit: μs). |
CPU_TIME | Total CPU time consumed by all threads (unit: μs). |
PLAN_TIME | Total time consumed for generating an execution plan (unit: μs). |
REWRITE_TIME | Total time consumed on query rewriting (unit: μs). |
PL_COMPILATION_TIME | Total time consumed for SQL compilation (unit: μs). |
PARSE_TIME | Total time consumed for parsing SQL statements (unit: μs). |
NET_SEND_TIME | Total time consumed for sending data over network (unit: μs). |
DATA_IO_TIME | Total time consumed for data read and write (unit: μs). |
SQL Statistics
The following table describes columns in the SQL Statistics report.
Table 10 Columns in the SQL Statistics report
Column | Description |
---|---|
Unique SQL Id | ID of the normalized SQL statement. |
Node Name | Node name. |
User Name | Username. |
Tuples Read | Number of tuples that are read. |
Calls | Number of calls. |
Min Elapse Time(us) | Minimum execution time (unit: us). |
Max Elapse Time(us) | Maximum execution time (unit: us). |
Total Elapse Time(us) | Total execution time (unit: us). |
Avg Elapse Time(us) | Average execution time (unit: us). |
Returned Rows | Number of rows returned by SELECT. |
Tuples Affected | Number of rows affected by INSERT, UPDATE, and DELETE. |
Logical Read | Number of logical reads on the buffer. |
Physical Read | Number of physical reads on the buffer. |
CPU Time(us) | CPU time (unit: us). |
Data IO Time(us) | Time spent on I/O (unit: us). |
Sort Count | Number of sorting execution times. |
Sort Time(us) | Sorting execution time (unit: us). |
Sort Mem Used(KB) | Size of work memory used during sorting (unit: KB). |
Sort Spill Count | Number of file writes when data is flushed to disks during sorting. |
Sort Spill Size(KB) | File size used when data is flushed to disks during sorting (unit: KB). |
Hash Count | Number of hashing execution times. |
Hash Time(us) | Hashing execution time (unit: us). |
Hash Mem Used(KB) | Size of work memory used during hashing (unit: KB). |
Hash Spill Count | Number of file writes when data is flushed to disks during hashing. |
Hash Spill Size(KB) | File size used when data is flushed to disks during hashing (unit: KB). |
SQL Text | Normalized SQL character string. |
Wait Events
The following table describes columns in the Wait Events report.
Table 11 Columns in the Wait Events report
Column | Description |
---|---|
Type | Wait events are classified as follows: - STATUS - LWLOCK_EVENT - LOCK_EVENT - IO_EVENT |
Event | Name of a wait event. |
Total Wait Time (us) | Total wait time (unit: us). |
Waits | Total number of wait times. |
Failed Waits | Number of wait failures. |
Avg Wait Time (us) | Average wait time (unit: us). |
Max Wait Time (us) | Maximum wait time (unit: us). |
Cache IO Stats
Cache IO Stats contains two tables: User table and User index. The columns in the tables are described as follows.
User table IO activity ordered by heap blks hit ratio
Table 12 Columns in the User table IO activity ordered by heap blks hit ratio report
Column | Description |
---|---|
DB Name | Database name. |
Schema Name | Schema name. |
Table Name | Table name. |
%Heap Blks Hit Ratio | Buffer pool hit ratio of the table. |
Heap Blks Read | Number of disk blocks read from the table. |
Heap Blks Hit | Number of cache hits in the table. |
Idx Blks Read | Number of disk blocks read from all indexes on the table. |
Idx Blks Hit | Number of cache hits in the table . |
Toast Blks Read | Number of disk blocks read from the TOAST table (if any) in the table. |
Toast Blks Hit | Number of buffer hits in the TOAST table (if any) in the table. |
Tidx Blks Read | Number of disk blocks read from the TOAST table index (if any) in the table. |
Tidx Blks Hit | Number of buffer hits in the TOAST table index (if any) in the table. |
User index IO activity ordered by idx blks hit ratio
Table 13 Columns in the User index IO activity ordered by idx blks hit ratio report
Column | Description |
---|---|
DB Name | Database name. |
Schema Name | Schema name. |
Table Name | Table name. |
Index Name | Index name. |
%Idx Blks Hit Ratio | Index hit ratio. |
Idx Blks Read | Number of disk blocks read from all indexes on the table. |
Idx Blks Hit | Number of cache hits in the table. |
Utility status
Utility status contains two tables: Replication slot and Replication stat. Columns in the tables are described as follows:
Replication slot
Table 14 Columns in the Replication slot report
Column | Description |
---|---|
Slot Name | Replication node name. |
Slot Type | Type of the replication node. |
DB Name | Name of the database on the replication node. |
Active | Replication node status. |
Xmin | Transaction ID of the replication node. |
Restart Lsn | Xlog file information on the replication node. |
Dummy Standby | Replication node as a dummy standby. |
Replication stat
Table 15 Columns in the Replication stat report
Column | Description |
---|---|
Thread Id | PID of the thread. |
Usesys Id | User system ID. |
Username | Username. |
Application Name | Application name. |
Client Addr | Client address. |
Client Hostname | Client host name. |
Client Port | Port of the client. |
Backend Start | Start time of an application. |
State | Log replication status. |
Sender Sent Location | Location where the sender sends logs. |
Receiver Write Location | Location where the receiver writes logs. |
Receiver Flush Location | Location where the receiver flushes logs. |
Receiver Replay Location | Location where the receiver replays logs. |
Sync Priority | Synchronization priority. |
Sync State | Synchronization status. |
Object stats
Object stats contains three tables: User Tables stats, User index stats, and Bad lock stats. Columns in the tables are described as follows:
User Tables stats
Table 16 Columns in the User Tables stats report
Column | Description |
---|---|
DB Name | Database name. |
Schema | Schema name. |
Relname | Relation name. |
Seq Scan | Number of sequential scans initiated on this table. |
Seq Tup Read | Number of live rows fetched by sequential scans. |
Index Scan | Number of index scans initiated on the table. |
Index Tup Fetch | Number of live rows fetched by index scans. |
Tuple Insert | Number of rows inserted. |
Tuple Update | Number of rows updated. |
Tuple Delete | Number of rows deleted. |
Tuple Hot Update | Number of rows HOT updated (with no separate index updated). |
Live Tuple | Estimated number of live rows. |
Dead Tuple | Estimated number of dead rows. |
Last Vacuum | Last time at which this table was manually vacuumed (not counting VACUUM FULL). |
Last Autovacuum | Last time at which this table was vacuumed by the autovacuum daemon. |
Last Analyze | Last time at which this table was manually analyzed. |
Last Autoanalyze | Last time at which this table was analyzed by the autovacuum daemon. |
Vacuum Count | Number of times the table has been manually vacuumed (not counting VACUUM FULL). |
Autovacuum Count | Number of times the table has been vacuumed by the autovacuum daemon. |
Analyze Count | Number of times the table has been manually analyzed. |
Autoanalyze Count | Number of times the table has been analyzed by the autovacuum daemon. |
User index stats
Table 17 Columns in the User index stats report
Column | Description |
---|---|
DB Name | Database name. |
Schema | Schema name. |
Relname | Relation name. |
Index Relname | Index name. |
Index Scan | Number of index scans initiated on the index. |
Index Tuple Read | Number of index entries returned by scans on the index. |
Index Tuple Fetch | Number of live table rows fetched by simple index scans using the index. |
Bad lock stats
Table 18 Columns in the Bad lock stats report
Column | Description |
---|---|
DB Id | OID of the database. |
Tablespace Id | Tablespace OID. |
Relfilenode | File object ID. |
Fork Number | File type. |
Error Count | Number of failures. |
First Time | First occurrence time. |
Last Time | Last occurrence time. |
Configuration settings
The following table describes columns in the Configuration settings report.
Table 19 Columns in the Configuration settings report
Column | Description |
---|---|
Name | GUC name. |
Abstract | GUC description. |
Type | Data type. |
Curent Value | Current value. |
Min Value | Valid minimum value. |
Max Value | Valid maximum value. |
Category | GUC type. |
Enum Values | All enumerated values. |
Default Value | Default parameter value used upon the database startup. |
Reset Value | Default parameter value used upon the database reset. |
SQL Detail
The following table describes columns in the SQL Detail report.
Table 20 Columns in the SQL Detail report
Column | Description |
---|---|
Unique SQL Id | ID of the normalized SQL statement. |
User Name | Username. |
Node Name | Node name. This column is not displayed in node mode. |
SQL Text | Normalized SQL text. |