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| author | Varun Gupta <varun.gupta@mariadb.com> | 2019-02-13 11:22:16 +0530 |
|---|---|---|
| committer | Varun Gupta <varun.gupta@mariadb.com> | 2019-02-13 11:52:36 +0530 |
| commit | be8709eb7bdf2a68a1c04fd8ab368113f5f39b63 (patch) | |
| tree | 35585804a654ec75089a92e90d546f73e7f60b68 /sql/sp_head.h | |
| parent | 6b979416e0e4eac0a036ca5f2b81b748a3d2e680 (diff) | |
| download | mariadb-git-be8709eb7bdf2a68a1c04fd8ab368113f5f39b63.tar.gz | |
MDEV-6111 Optimizer Trace
This task involves the implementation for the optimizer trace.
This feature produces a trace for any SELECT/UPDATE/DELETE/,
which contains information about decisions taken by the optimizer during
the optimization phase (choice of table access method, various costs,
transformations, etc). This feature would help to tell why some decisions were
taken by the optimizer and why some were rejected.
Trace is session-local, controlled by the @@optimizer_trace variable.
To enable optimizer trace we need to write:
set @@optimizer_trace variable= 'enabled=on';
To display the trace one can run:
SELECT trace FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
This task also involves:
MDEV-18489: Limit the memory used by the optimizer trace
introduces a switch optimizer_trace_max_mem_size which limits
the memory used by the optimizer trace. This was implemented by
Sergei Petrunia.
Diffstat (limited to 'sql/sp_head.h')
| -rw-r--r-- | sql/sp_head.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sql/sp_head.h b/sql/sp_head.h index 8db6ecac9e7..f59da93d8aa 100644 --- a/sql/sp_head.h +++ b/sql/sp_head.h @@ -2024,6 +2024,7 @@ private: }; // class sp_instr_set_case_expr : public sp_instr_opt_meta +bool check_show_routine_access(THD *thd, sp_head *sp, bool *full_access); #ifndef NO_EMBEDDED_ACCESS_CHECKS bool |