Documentation Home
Oracle Enterprise Manager for MySQL Database User's Guide
Download this Manual
PDF (US Ltr) - 0.7Mb
PDF (A4) - 0.7Mb
HTML Download (TGZ) - 223.8Kb
HTML Download (Zip) - 231.3Kb

Oracle Enterprise Manager for MySQL Database User's Guide  /  Configuration Metrics  /  Statement Processing Configuration Metrics

7.32 Statement Processing Configuration Metrics

Lists the Statement Processing configuration metrics and provides a brief description of each.

Table 7.32 Statement Processing Configuration Metrics

Auto Is Null EnabledIf this variable is set to 1, then after a statement that successfully inserts an automatically generated AUTO_INCREMENT value, you can find that value by issuing a statement of the following form: SELECT * FROM tbl_name WHERE auto_col IS NULL If the statement returns a row, the value returned is the same as if you invoked the LAST_INSERT_ID() function.
Big Selects EnabledIf set to 0, MySQL aborts SELECT statements that are likely to take a very long time to execute (that is, statements for which the optimizer estimates that the number of examined rows exceeds the value of max_join_size). This is useful when an inadvisable WHERE statement has been issued.
Buffer Result EnabledIf set to 1, sql_buffer_result forces results from SELECT statements to be put into temporary tables. This helps MySQL free the table locks early and can be beneficial in cases where it takes a long time to send results to the client.
Cte Max Recursion DepthThe common table expression (CTE) maximum recursion depth. The server terminates execution of any CTE that recurses more levels than the value of this variable.
Div Precision IncrementIndicates the number of digits by which to increase the scale of the result of division operations performed with the / operator.
Group Concat Max LenThe maximum permitted result length in bytes for the GROUP_CONCAT() function.
Internal Tmp Disk Storage EngineThe storage engine for on-disk internal temporary tables. Permitted values are MYISAM and INNODB.
Internal Tmp Mem Storage EngineThe storage engine for in-memory internal temporary tables. Permitted values are TempTable and MEMORY.
Max Digest LengthThe maximum number of bytes available for computing statement digests. When this amount of space is used for computing the digest for a statement, no further tokens from the parsed statement are collected or figure into the digest value. Statements differing only after that many bytes of parsed statement tokens produce the same digest and are aggregated for digest statistics.
Max Error CountThe maximum number of error, warning, and note messages to be stored for display by the SHOW ERRORS and SHOW WARNINGS statements.
Max Execution TimeThe execution timeout for SELECT statements, in milliseconds. If the value is 0, timeouts are not enabled.
Max Join SizeDo not permit statements that probably need to examine more than max_join_size rows (for single-table statements) or row combinations (for multiple-table statements) or that are likely to do more than max_join_size disk seeks.
Max Prepared Stmt CountLimits the total number of prepared statements in the server.
Max Sp Recursion DepthThe number of times that any given stored procedure may be called recursively. Stored procedure recursion increases the demand on thread stack space. If you increase the value of max_sp_recursion_depth, it may be necessary to increase thread stack size by increasing the value of thread_stack at server startup.
Max Write Lock CountAfter this many write locks, permit some pending read lock requests to be processed in between.
Notes EnabledIf set to 1 (the default), warnings of Note level increment warning_count and the server records them. If set to 0, Note warnings do not increment warning_count and the server does not record them.
Quote Show Create EnabledIf set to 1 (the default), the server quotes identifiers for SHOW CREATE TABLE and SHOW CREATE DATABASE statements. If set to 0, quoting is disabled.
Safe Updates EnabledIf set to 1, MySQL aborts UPDATE or DELETE statements that do not use a key in the WHERE clause or a LIMIT clause. This makes it possible to catch UPDATE or DELETE statements where keys are not used properly and that would probably change or delete a large number of rows.
Select LimitThe maximum number of rows to return from SELECT statements. The default value for a new connection is the maximum number of rows that the server permits per table.
Temptable Max RamDefines the maximum amount of memory (in bytes) that can be occupied by the TempTable storage engine before data is stored on disk.
Warnings EnabledThis variable controls whether single-row INSERT statements produce an information string if warnings occur.