In pg_upgrade, create a script to incrementally generate more accurate
optimizer statistics so the cluster can be made available sooner.
This commit is contained in:
Bruce Momjian
parent
d4318483e1
commit
faec2815c8
@ -23,6 +23,11 @@ static void check_for_reg_data_type_usage(ClusterInfo *cluster);
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static void check_for_support_lib(ClusterInfo *cluster);
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static void get_bin_version(ClusterInfo *cluster);
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#ifndef WIN32
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#define ECHO_QUOTE "'"
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#else
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#define ECHO_QUOTE ""
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#endif
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void
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output_check_banner(bool *live_check)
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@ -193,21 +198,20 @@ issue_warnings(char *sequence_script_file_name)
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void
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output_completion_banner(char *deletion_script_file_name)
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output_completion_banner(char *analyze_script_file_name,
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char *deletion_script_file_name)
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{
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/* Did we copy the free space files? */
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if (GET_MAJOR_VERSION(old_cluster.major_version) >= 804)
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pg_log(PG_REPORT,
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"Optimizer statistics are not transferred by pg_upgrade so\n"
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"consider running:\n"
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" vacuumdb --all --analyze-only\n"
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"on the newly-upgraded cluster.\n\n");
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"Optimizer statistics are not transferred by pg_upgrade so,\n"
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"once you start the new server, consider running:\n"
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" %s\n\n", analyze_script_file_name);
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else
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pg_log(PG_REPORT,
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"Optimizer statistics and free space information are not transferred\n"
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"by pg_upgrade so consider running:\n"
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" vacuumdb --all --analyze\n"
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"on the newly-upgraded cluster.\n\n");
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"by pg_upgrade so, once you start the new server, consider running:\n"
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" %s\n\n", analyze_script_file_name);
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pg_log(PG_REPORT,
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"Running this script will delete the old cluster's data files:\n"
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@ -379,6 +383,130 @@ check_new_cluster_is_empty(void)
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}
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/*
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* create_script_for_cluster_analyze()
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*
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* This incrementally generates better optimizer statistics
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*/
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void
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create_script_for_cluster_analyze(char **analyze_script_file_name)
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{
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FILE *script = NULL;
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*analyze_script_file_name = pg_malloc(MAXPGPATH);
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prep_status("Creating script to analyze new cluster");
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snprintf(*analyze_script_file_name, MAXPGPATH, "analyze_new_cluster.%s",
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SCRIPT_EXT);
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if ((script = fopen_priv(*analyze_script_file_name, "w")) == NULL)
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pg_log(PG_FATAL, "Could not open file \"%s\": %s\n",
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*analyze_script_file_name, getErrorText(errno));
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#ifndef WIN32
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/* add shebang header */
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fprintf(script, "#!/bin/sh\n\n");
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#endif
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fprintf(script, "echo %sThis script will generate minimal optimizer statistics rapidly%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo %sso your system is usable, and then gather statistics twice more%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo %swith increasing accuracy. When it is done, your system will%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo %shave the default level of optimizer statistics.%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo\n\n");
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fprintf(script, "echo %sIf you have used ALTER TABLE to modify the statistics target for%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo %sany tables, you might want to remove them and restore them after%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo %srunning this script because they will delay fast statistics generation.%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo\n\n");
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fprintf(script, "echo %sIf you would like default statistics as quickly as possible, cancel%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo %sthis script and run:%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo %s vacuumdb --all %s%s\n", ECHO_QUOTE,
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/* Did we copy the free space files? */
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(GET_MAJOR_VERSION(old_cluster.major_version) >= 804) ?
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"--analyze-only" : "--analyze", ECHO_QUOTE);
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fprintf(script, "echo\n\n");
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#ifndef WIN32
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fprintf(script, "sleep 2\n");
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fprintf(script, "PGOPTIONS='-c default_statistics_target=1 -c vacuum_cost_delay=0'\n");
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/* only need to export once */
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fprintf(script, "export PGOPTIONS\n");
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#else
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fprintf(script, "REM simulate sleep 2\n");
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fprintf(script, "PING 1.1.1.1 -n 1 -w 2000 > nul\n");
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fprintf(script, "SET PGOPTIONS=-c default_statistics_target=1 -c vacuum_cost_delay=0\n");
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#endif
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fprintf(script, "echo %sGenerating minimal optimizer statistics (1 target)%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo %s--------------------------------------------------%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "vacuumdb --all --analyze-only\n");
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fprintf(script, "echo\n");
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fprintf(script, "echo %sThe server is now available with minimal optimizer statistics.%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo %sQuery performance will be optimal once this script completes.%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo\n\n");
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#ifndef WIN32
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fprintf(script, "sleep 2\n");
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fprintf(script, "PGOPTIONS='-c default_statistics_target=10'\n");
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#else
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fprintf(script, "REM simulate sleep\n");
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fprintf(script, "PING 1.1.1.1 -n 1 -w 2000 > nul\n");
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fprintf(script, "SET PGOPTIONS=-c default_statistics_target=10\n");
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#endif
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fprintf(script, "echo %sGenerating medium optimizer statistics (10 targets)%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo %s---------------------------------------------------%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "vacuumdb --all --analyze-only\n");
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fprintf(script, "echo\n\n");
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#ifndef WIN32
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fprintf(script, "unset PGOPTIONS\n");
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#else
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fprintf(script, "SET PGOPTIONS\n");
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#endif
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fprintf(script, "echo %sGenerating default (full) optimizer statistics (100 targets?)%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "echo %s-------------------------------------------------------------%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fprintf(script, "vacuumdb --all %s\n",
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/* Did we copy the free space files? */
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(GET_MAJOR_VERSION(old_cluster.major_version) >= 804) ?
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"--analyze-only" : "--analyze");
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fprintf(script, "echo\n\n");
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fprintf(script, "echo %sDone%s\n",
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ECHO_QUOTE, ECHO_QUOTE);
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fclose(script);
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#ifndef WIN32
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if (chmod(*analyze_script_file_name, S_IRWXU) != 0)
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pg_log(PG_FATAL, "Could not add execute permission to file \"%s\": %s\n",
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*analyze_script_file_name, getErrorText(errno));
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#endif
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check_ok();
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}
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/*
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* create_script_for_old_cluster_deletion()
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*
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@ -67,6 +67,7 @@ int
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main(int argc, char **argv)
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{
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char *sequence_script_file_name = NULL;
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char *analyze_script_file_name = NULL;
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char *deletion_script_file_name = NULL;
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bool live_check = false;
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@ -142,6 +143,7 @@ main(int argc, char **argv)
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new_cluster.pgdata, UTILITY_LOG_FILE);
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check_ok();
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create_script_for_cluster_analyze(&analyze_script_file_name);
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create_script_for_old_cluster_deletion(&deletion_script_file_name);
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issue_warnings(sequence_script_file_name);
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@ -149,8 +151,10 @@ main(int argc, char **argv)
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pg_log(PG_REPORT, "\nUpgrade Complete\n");
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pg_log(PG_REPORT, "----------------\n");
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output_completion_banner(deletion_script_file_name);
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output_completion_banner(analyze_script_file_name,
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deletion_script_file_name);
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pg_free(analyze_script_file_name);
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pg_free(deletion_script_file_name);
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pg_free(sequence_script_file_name);
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@ -283,10 +283,12 @@ void check_old_cluster(bool live_check,
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void check_new_cluster(void);
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void report_clusters_compatible(void);
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void issue_warnings(char *sequence_script_file_name);
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void output_completion_banner(char *deletion_script_file_name);
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void output_completion_banner(char *analyze_script_file_name,
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char *deletion_script_file_name);
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void check_cluster_versions(void);
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void check_cluster_compatibility(bool live_check);
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void create_script_for_old_cluster_deletion(char **deletion_script_file_name);
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void create_script_for_cluster_analyze(char **analyze_script_file_name);
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/* controldata.c */
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