SelectWithUnionQuery (children 1) ExpressionList (children 1) SelectQuery (children 1) ExpressionList (children 1) Literal UInt64_1 SQL EXPLAIN AST ALTER TABLE t1 DELETE WHERE date = today(); SQL explain AlterQuery t1 (children 1) ExpressionList (children 1) AlterCommand 27 (children 1)...
Example EXPLAIN outputThe XML result of the EXPLAIN command with row numbers turned on is:XML Kopiera 1 \<?xml version="1.0" encoding="utf-8"?> 2 <dsql_query> 3 <sql>SELECT CAST (AVG(YearlyIncome) AS int) AS AverageIncome, 4 CAST(AVG(FIS.SalesAmount) AS int) AS AverageSales,...
The EXPLAIN command provides information about how MySQL executes queries. EXPLAIN can work with SELECT, DELETE, INSERT, REPLACE, and UPDATE statements. We'll first analyze the original query, then attempt to optimize the query and look into the optimiz
explain AlterQuery t1 (children 1) ExpressionList (children 1) AlterCommand 27 (children 1) Function equals (children 1) ExpressionList (children 2) Identifier date Function today (children 1) ExpressionListEXPLAIN SYNTAX Returns query after syntax optimizations. Example:...
you may be able toimprove the performance of your query by examining the WHERE clause to checkwhether it refers to some column or columns that would be suitable forindexing. If so, create an appropriate index and check the query with EXPLAINagain. See Section 12.1.7, “ALTER TABLE Syntax”...
ALTER PARTITION(Enterprise) ALTER PRIMARY KEY ALTER RANGE ALTER ROLE ALTER SCHEMA ALTER SEQUENCE ALTER TABLE ALTER TYPE ALTER USER AS OF SYSTEM TIME EXPERIMENTAL_AUDIT ALTER VIEW BACKUP BEGIN CANCEL JOB CANCEL QUERY CANCEL SESSION COMMENT ON
you may be able toimprove the performance of your query by examining the WHERE clause to checkwhether it refers to some column or columns that would be suitable forindexing. If so, create an appropriate index and check the query with EXPLAINagain. See Section 12.1.7, “ALTER TABLE Syntax”...
Command line: cockroach statement-diag list / download (6 rows) Navigating to the URL will automatically download the ZIP file. You can also obtain the bundle by activating statement diagnostics in the DB Console. See also ALTER TABLE ALTER SEQUENCE BACKUP CANCEL JOB CREATE DATABASE DROP DATA...
db2=>update command options using C off--或on,只是临时改变 命令行下 db2set db2options=+c --或-c,永久改变 45. 获取当前机器db2所有配置信息: dbname 此时数据库管理程序将生成一个db2support 压缩文件包。 46. 更新数据库版本级别(适用于使用不通版本备份恢复时使用) ...
Action: Refresh the materialized view or alter the rewrite integrity mode with ALTER SESSION QUERY_REWRITE_INTEGRITY = STALE TOLERATED command. QSM-01030 materialized view, string, has PL/SQL functions in ENFORCED integrity mode Cause: A materialized view with PL/SQL functions in its definition cann...