- About TiDB
- Quick Start
- Deploy
- Software and Hardware Requirements
- Environment Configuration Checklist
- Topology Patterns
- Install and Start
- Verify Cluster Status
- Migrate
- Maintain
- Upgrade
- Scale
- Backup and Restore
- Use BR Tool (Recommended)
- Read Historical Data
- Configure Time Zone
- Daily Checklist
- Maintain TiFlash
- Maintain TiDB Using TiUP
- Modify Configuration Online
- Monitor and Alert
- Troubleshoot
- TiDB Troubleshooting Map
- Identify Slow Queries
- Analyze Slow Queries
- SQL Diagnostics
- Identify Expensive Queries
- Statement Summary Tables
- Troubleshoot Hotspot Issues
- Troubleshoot Increased Read and Write Latency
- Troubleshoot Cluster Setup
- Troubleshoot High Disk I/O Usage
- Troubleshoot Lock Conflicts
- Troubleshoot TiFlash
- Troubleshoot Write Conflicts in Optimistic Transactions
- Performance Tuning
- System Tuning
- Software Tuning
- SQL Tuning
- Overview
- Understanding the Query Execution Plan
- SQL Optimization Process
- Overview
- Logic Optimization
- Physical Optimization
- Prepare Execution Plan Cache
- Control Execution Plans
- Tutorials
- TiDB Ecosystem Tools
- Reference
- Cluster Architecture
- Key Monitoring Metrics
- Secure
- Privileges
- SQL
- SQL Language Structure and Syntax
- SQL Statements
ADD COLUMN
ADD INDEX
ADMIN
ADMIN CANCEL DDL
ADMIN CHECKSUM TABLE
ADMIN CHECK [TABLE|INDEX]
ADMIN SHOW DDL [JOBS|QUERIES]
ALTER DATABASE
ALTER INDEX
ALTER INSTANCE
ALTER TABLE
ALTER USER
ANALYZE TABLE
BACKUP
BEGIN
CHANGE COLUMN
COMMIT
CHANGE DRAINER
CHANGE PUMP
CREATE [GLOBAL|SESSION] BINDING
CREATE DATABASE
CREATE INDEX
CREATE ROLE
CREATE SEQUENCE
CREATE TABLE LIKE
CREATE TABLE
CREATE USER
CREATE VIEW
DEALLOCATE
DELETE
DESC
DESCRIBE
DO
DROP [GLOBAL|SESSION] BINDING
DROP COLUMN
DROP DATABASE
DROP INDEX
DROP ROLE
DROP SEQUENCE
DROP STATS
DROP TABLE
DROP USER
DROP VIEW
EXECUTE
EXPLAIN ANALYZE
EXPLAIN
FLASHBACK TABLE
FLUSH PRIVILEGES
FLUSH STATUS
FLUSH TABLES
GRANT <privileges>
GRANT <role>
INSERT
KILL [TIDB]
LOAD DATA
LOAD STATS
MODIFY COLUMN
PREPARE
RECOVER TABLE
RENAME INDEX
RENAME TABLE
REPLACE
RESTORE
REVOKE <privileges>
REVOKE <role>
ROLLBACK
SELECT
SET DEFAULT ROLE
SET [NAMES|CHARACTER SET]
SET PASSWORD
SET ROLE
SET TRANSACTION
SET [GLOBAL|SESSION] <variable>
SHOW ANALYZE STATUS
SHOW [BACKUPS|RESTORES]
SHOW [GLOBAL|SESSION] BINDINGS
SHOW BUILTINS
SHOW CHARACTER SET
SHOW COLLATION
SHOW [FULL] COLUMNS FROM
SHOW CONFIG
SHOW CREATE SEQUENCE
SHOW CREATE TABLE
SHOW CREATE USER
SHOW DATABASES
SHOW DRAINER STATUS
SHOW ENGINES
SHOW ERRORS
SHOW [FULL] FIELDS FROM
SHOW GRANTS
SHOW INDEX [FROM|IN]
SHOW INDEXES [FROM|IN]
SHOW KEYS [FROM|IN]
SHOW MASTER STATUS
SHOW PLUGINS
SHOW PRIVILEGES
SHOW [FULL] PROCESSSLIST
SHOW PROFILES
SHOW PUMP STATUS
SHOW SCHEMAS
SHOW STATS_HEALTHY
SHOW STATS_HISTOGRAMS
SHOW STATS_META
SHOW STATUS
SHOW TABLE NEXT_ROW_ID
SHOW TABLE REGIONS
SHOW TABLE STATUS
SHOW [FULL] TABLES
SHOW [GLOBAL|SESSION] VARIABLES
SHOW WARNINGS
SHUTDOWN
SPLIT REGION
START TRANSACTION
TRACE
TRUNCATE
UPDATE
USE
- Data Types
- Functions and Operators
- Overview
- Type Conversion in Expression Evaluation
- Operators
- Control Flow Functions
- String Functions
- Numeric Functions and Operators
- Date and Time Functions
- Bit Functions and Operators
- Cast Functions and Operators
- Encryption and Compression Functions
- Information Functions
- JSON Functions
- Aggregate (GROUP BY) Functions
- Window Functions
- Miscellaneous Functions
- Precision Math
- Set Operations
- List of Expressions for Pushdown
- Clustered Indexes
- Constraints
- Generated Columns
- SQL Mode
- Transactions
- Garbage Collection (GC)
- Views
- Partitioning
- Character Set and Collation
- System Tables
mysql
- INFORMATION_SCHEMA
- Overview
ANALYZE_STATUS
CHARACTER_SETS
CLUSTER_CONFIG
CLUSTER_HARDWARE
CLUSTER_INFO
CLUSTER_LOAD
CLUSTER_LOG
CLUSTER_SYSTEMINFO
COLLATIONS
COLLATION_CHARACTER_SET_APPLICABILITY
COLUMNS
DDL_JOBS
ENGINES
INSPECTION_RESULT
INSPECTION_RULES
INSPECTION_SUMMARY
KEY_COLUMN_USAGE
METRICS_SUMMARY
METRICS_TABLES
PARTITIONS
PROCESSLIST
SCHEMATA
SEQUENCES
SESSION_VARIABLES
SLOW_QUERY
STATISTICS
TABLES
TABLE_CONSTRAINTS
TABLE_STORAGE_STATS
TIDB_HOT_REGIONS
TIDB_INDEXES
TIDB_SERVERS_INFO
TIFLASH_REPLICA
TIKV_REGION_PEERS
TIKV_REGION_STATUS
TIKV_STORE_STATUS
USER_PRIVILEGES
VIEWS
METRICS_SCHEMA
- UI
- TiDB Dashboard
- Overview
- Maintain
- Access
- Overview Page
- Cluster Info Page
- Key Visualizer Page
- Metrics Relation Graph
- SQL Statements Analysis
- Slow Queries Page
- Cluster Diagnostics
- Search Logs Page
- Profile Instances Page
- FAQ
- TiDB Dashboard
- CLI
- Command Line Flags
- Configuration File Parameters
- System Variables
- Storage Engines
- TiUP
- Telemetry
- Errors Codes
- Table Filter
- Schedule Replicas by Topology Labels
- FAQs
- Glossary
- Release Notes
- All Releases
- TiDB Roadmap
- v5.0
- v4.0
- v3.1
- v3.0
- v2.1
- v2.0
- v1.0
TiDB 2.0.6 Release Notes
On August 6, 2018, TiDB 2.0.6 is released. Compared with TiDB 2.0.5, this release has great improvement in system compatibility and stability.
TiDB
- Improvements
- Make "set system variable" log shorter to save disk space #7031
- Record slow operations during the execution of
ADD INDEX
in the log, to make troubleshooting easier #7083 - Reduce transaction conflicts when updating statistics #7138
- Improve the accuracy of row count estimation when the values pending to be estimated exceeds the statistics range #7185
- Choose the table with a smaller estimated row count as the outer table for
Index Join
to improve its execution efficiency #7277 - Add the recover mechanism for panics occurred during the execution of
ANALYZE TABLE
, to avoid that the tidb-server is unavailable caused by abnormal behavior in the process of collecting statistics #7228 - Return
NULL
and the corresponding warning when the results ofRPAD
/LPAD
exceed the value of themax_allowed_packet
system variable, compatible with MySQL #7244 - Set the upper limit of placeholders count in the
PREPARE
statement to 65535, compatible with MySQL #7250
- Bug Fixes
- Fix the issue that the
DROP USER
statement is incompatible with MySQL behavior in some cases #7014 - Fix the issue that statements like
INSERT
/LOAD DATA
meet OOM after openingtidb_batch_insert
#7092 - Fix the issue that the statistics fail to automatically update when the data of a table keeps updating #7093
- Fix the issue that the firewall breaks inactive gPRC connections #7099
- Fix the issue that prefix index returns a wrong result in some scenarios #7126
- Fix the panic issue caused by outdated statistics in some scenarios #7155
- Fix the issue that one piece of index data is missed after the
ADD INDEX
operation in some scenarios #7156 - Fix the wrong result issue when querying
NULL
values using the unique index in some scenarios #7172 - Fix the messy code issue of the
DECIMAL
multiplication result in some scenarios #7212 - Fix the wrong result issue of
DECIMAL
modulo operation in some scenarios #7245 - Fix the issue that the
UPDATE
/DELETE
statement in a transaction returns a wrong result under some special sequence of statements #7219 - Fix the panic issue of the
UNION ALL
/UPDATE
statement during the process of building the execution plan in some scenarios #7225 - Fix the issue that the range of prefix index is calculated incorrectly in some scenarios #7231
- Fix the issue that the
LOAD DATA
statement fails to write the binlog in some scenarios #7242 - Fix the wrong result issue of
SHOW CREATE TABLE
during the execution process ofADD INDEX
in some scenarios #7243 - Fix the issue that panic occurs when
Index Join
does not initialize timestamps in some scenarios #7246 - Fix the false alarm issue when
ADMIN CHECK TABLE
mistakenly uses the timezone in the session #7258 - Fix the issue that
ADMIN CLEANUP INDEX
does not clean up the index in some scenarios #7265 - Disable the Read Committed isolation level #7282
- Fix the issue that the
TiKV
- Improvements
- Enlarge scheduler's default slots to reduce false conflicts
- Reduce continuous records of rollback transactions, to improve the Read performance when conflicts are extremely severe
- Limit the size and number of RocksDB log files, to reduce unnecessary disk usage in long-running condition
- Bug Fixes
- Fix the crash issue when converting the data type from string to decimal