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55 lines
1.9 KiB
SQL
55 lines
1.9 KiB
SQL
--
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-- PERFORMANCE SCHEMA INSTALLATION
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-- Note that this script is also reused by mysql_upgrade,
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-- so we have to be very careful here to not destroy any
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-- existing database named 'performance_schema' if it
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-- can contain user data.
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-- In case of downgrade, it's ok to drop unknown tables
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-- from a future version, as long as they belong to the
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-- performance schema engine.
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--
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set @have_old_pfs= (select count(*) from information_schema.schemata where schema_name='performance_schema');
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SET @cmd="SET @broken_tables = (select count(*) from information_schema.tables where engine != 'PERFORMANCE_SCHEMA' and table_schema='performance_schema')";
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-- Work around for bug#49542
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SET @str = IF(@have_old_pfs = 1, @cmd, 'SET @broken_tables = 0');
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PREPARE stmt FROM @str;
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EXECUTE stmt;
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DROP PREPARE stmt;
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SET @cmd="SET @broken_views = (select count(*) from information_schema.views where table_schema='performance_schema')";
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-- Work around for bug#49542
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SET @str = IF(@have_old_pfs = 1, @cmd, 'SET @broken_views = 0');
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PREPARE stmt FROM @str;
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EXECUTE stmt;
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DROP PREPARE stmt;
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SET @broken_routines = (select count(*) from mysql.proc where db='performance_schema');
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SET @broken_events = (select count(*) from mysql.event where db='performance_schema');
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SET @broken_pfs= (select @broken_tables + @broken_views + @broken_routines + @broken_events);
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--
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-- The performance schema database.
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-- Only drop and create the database if this is safe (no broken_pfs).
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-- This database is created, even in --without-perfschema builds,
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-- so that the database name is always reserved by the MySQL implementation.
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--
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SET @cmd= "DROP DATABASE IF EXISTS performance_schema";
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SET @str = IF(@broken_pfs = 0, @cmd, 'SET @dummy = 0');
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PREPARE stmt FROM @str;
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EXECUTE stmt;
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DROP PREPARE stmt;
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SET @cmd= "CREATE DATABASE performance_schema character set utf8mb3";
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SET @str = IF(@broken_pfs = 0, @cmd, 'SET @dummy = 0');
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PREPARE stmt FROM @str;
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EXECUTE stmt;
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DROP PREPARE stmt;
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